Improvement in service-valves



RMAGNUS. Service Valve.

No. 199,079; Pat ented Jan. 8, I878.

ATTORNEYS.

UNITED STATES PATENT OFFICE.

PAUL MAGNUS, OF NEW YORK, N. Y.

IMPROVEMENT lN SERVICE-VALVES.

Specification forming part of Letters Patent No. 199,079, dated January8,1878; application filed December 13, 1877.

To all whom it may concern:

Be it known that I, PAUL MAGNUs, of the city, county, and State of NewYork, have invented a new and Improved Service-Valve, of which thefollowing is a specification:

In the accompanying drawing, Figure 1 represents a sectional elevationof my improved service-valve; and Fig. 2, a horizontal section of thesame on line or m, Fig. 1.

Similar letters of reference indicate corresponding parts.

This invention is intended to furnish for water-pipes of all kinds, andespecially for such as are exposed to freezing, an improved valve, bywhich the water may be drained ofi as soon as the supply-valve proper isclosed,

and the water-escape instantly shut as soon as the valve is opened.

The invention consists of a screw-spindle having an upper and lowerthread, of which the lower screw-thread is of greater pitch than theupper, so as to raise a sliding and guided drain-valve at the lowermostpoint of the valve-casing when the supply-valve reaches its seat, andclose the lower drain-valve tightly by the raising of the water-supplyvalve.

In the drawing, A represents the screwspindle of my improved valve forservice and other water pipes. The spindle is kept tight in thevalve-casing by a suitable screw-bushing, inthe usual manner, and turnedby a key, or in other suitable manner.

The screw-spindle A carries a fixed supplyvalve, B, that closes tightlyon a seat, B, around the supply-openin g when the spindle is screweddown. The screw-spindle A is extended downward through the supply-opening,

. and provided at the lower part with a second screw-thread, of greaterpitch than the upper thread, the lower thread engaging a drainvalve, 0,arranged at the lowermost point of the valve-casing, and guided in anopen cylindrical portion, 0, of the same by a groove and set-screw. Theset-screw a prevents the axial motion of the drain-valve. Thedrain-valve O has a number of side channels, I), for the exit of thewater, as shown in Fig. 2, and a packing below a top flange, 01, so asto close tightly on the seat '01 of the exit-tube G when the exitvalveis screwed down. The turning of the screw spindle for closing thesupply-valve causes, by the quicker pitch of the lower thread, theraising of the drain-valve as soon as the upper valve bears on its seat.

The opening of the upper or supply valve causes, vice versa, the instantclosing of the 7,

drain-valve, so as to prevent any loss of water when turning the sameon. The water in the service-pipe is thus drained ofi' at the lowermostpart of the valve, and thereby the danger of freezing prevented. This isaccomplished by the double screw-spindle in reliable manner, without theobjectionable features of the cone-valves, that are, by their suddenclosing, frequently the cause of the bursting of the pipes.

The automatic working of the drain-valve, in connection with the openingand. closing-of the supply-valve, prevents any waste of water, as thedrain-valve is called into play after the supply-valve has been openedor closed.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- As an improvement in screw valves, the combination ofa central screwspindle, having a lower screw-thread of greater pitchthan the upper thread, with a fixed supply-valve and a verticallysliding and guided drain-valve, that is opened or closed as thesupply-valve is closed or opened, substantially as and for the purposeset forth.

' PAUL MAGNUS. Witnesses:

PAUL GOEPEL, O. SEDGWICK.

